Abstract
In this study, a multifunctional Ba2GdF7:Yb3+, Er3+/Ag2S NCs was synthesized, which could realize temperature measurement and photothermal conversion. The temperature sensing properties of Ba2GdF7:Yb3+, Er3+/Ag2S NCs based on FIR technology were investigated in the range of 300K–360K. The results indicate that the maximum values of Sa and Sr are 0.073 K−1@360K and 1.406%K−1@300K, respectively. Next, the photothermal effect of the content of Ba2GdF7: Yb3+, Er3+ on Ag2S in the composites was evaluated. Appropriate amount of Ba2GdF7: Yb3+, Er3+ can enhance the photothermal efficiency of Ag2S, which is attributed to Ag2S absorbing visible light emitted from the up-conversion process of Ba2GdF7:Yb3+, Er3+ and releasing heat. Then, in egg white, Ba2GdF7:Yb3+, Er3+ based on FIR technology can monitor temperature of Ag2S photothermal therapy. Ultimately, the cytotoxicity test on HeLa cells using methyl thiazolyl tetrazolium (MTT) assay showed good biocompatibility of the Ba2GdF7:Yb3+, Er3+/Ag2S NCs.
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